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Home/Cars/BMW/5 Series/G30/G31 (2017-2024)/how to fix P0302 misfire code on BMW 5 Series G30/G31 (2017-2024)

how to fix P0302 misfire code on BMW 5 Series G30/G31 (2017-2024)

BMW 5 Series G30/G31 (2017-2024)

Severity: mediumDifficulty: mediumError Code: P03022-4 hours
3 min read
533 words

Problem Statement

## Problem Statement The vehicle is displaying a P0302 trouble code, indicating a misfire in cylinder 2 of a 2017-2024 BMW 5 Series G30/G31.

Error Code
P0302
Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before attempting to remove any components.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or engine shaking
  • •Loss of power during acceleration
  • •Increased fuel consumption
  • •Possible engine stalling
  • •Engine noise changes, like popping or backfiring

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0302 and check for any additional codes.
  2. 2Inspect spark plug for cylinder 2, checking for wear, carbon deposits, or damage.
  3. 3Measure the resistance of the ignition coil for cylinder 2 using a multimeter.
  4. 4Perform a compression test on cylinder 2 to assess the mechanical condition.
  5. 5Check fuel injector operation for cylinder 2 by listening for clicking sounds or using a noid light.
  6. 6Inspect vacuum lines and intake manifold for leaks that could affect cylinder performance.

Solution

Solution

1. Preparation

  • Gather tools and parts necessary for the repair.
  • Disconnect the negative battery terminal to ensure safety during repairs.

2. Replace Spark Plug

  • Tools Required: Socket set, torque wrench, spark plug socket.
  • Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
  • Carefully extract the spark plug using a spark plug socket.
  • Inspect the old spark plug for wear; replace with a new one if necessary.
  • Install the new spark plug, ensuring it is torqued to the manufacturer's specifications (usually around 18 Nm).
  • Reattach the ignition coil, securing it with the retaining bolts.

3. Replace Ignition Coil

  • If the ignition coil is faulty, follow these steps:
  • Tools Required: Socket set.
  • Disconnect the electrical connector from the ignition coil.
  • Remove the ignition coil retaining bolts and lift out the old coil.
  • Install the new ignition coil, ensuring a secure fit and reconnecting the electrical connector.

4. Inspect and Clean Fuel Injector

  • If the fuel injector is suspected to be faulty:
  • Tools Required: Fuel injector removal tool.
  • Disconnect the fuel line and electrical connector from the fuel injector.
  • Remove the injector from the rail.
  • Clean the injector using a fuel injector cleaner or replace it if necessary.
  • Reinstall the fuel injector and reconnect all lines and connectors.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
  • Carefully extract the spark plug using a spark plug socket.
  • Inspect the old spark plug for wear; replace with a new one if necessary.
  • Reattach the ignition coil, securing it with the retaining bolts.

Parts Required

  • Spark plug (for cylinder 2)
  • Ignition coil (if faulty)
  • Fuel injector (if faulty)

Additional Information

Error CodeP0302
Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

4 items

Parts

3 items

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